Data for the residential voice tracker was collected from annual reports, quarterly reports, and other secondary sources. The tracker is an informative analysis about the competitive landscape of the voice Markets' subscribers and revenues from 2007-2009, on a quarterly basis.

Data for the residential voice tracker was collected from annual reports, quarterly reports, and other secondary sources. The tracker is an informative analysis about the competitive landscape of the voice Markets' subscribers and revenues from 2007-2009, on a quarterly basis. Read Less